They no longer recommend using a traditional email account, instead recommending chatmail servers like these (there’s more as well, but they have this small list to choose from in the app or you can bring your own). They say if you have to use traditional email use a dedicated account for delta chat, not one that also gets traditional email.

I like how they are trying to address metadata as much as possible, the onboarding is so easy my literal mother can do it, video/audio calling is in beta and works pretty well (some glitches, but it’s in beta), the webXDC stuff is cool but I don’t really use it yet, and I’m sure I’m forgetting something.